What may not be operated without the EIC's permission on Out of Service tracks?

Interlocking appliances are critical components in railway operations that help manage the movement and safety of trains by controlling switches and signals. When tracks are designated as Out of Service, it indicates that they are not available for normal train operations due to maintenance, repairs, or other safety concerns.

Operating interlocking appliances without the permission of the Engineering in Charge (EIC) can pose significant safety risks, as it could lead to unauthorized movements of trains or equipment in an area that is not monitored or safe for operations. The EIC ensures that any movements or operations on Out of Service tracks are conducted responsibly and with the appropriate safety measures in place. Therefore, it is essential that interlocking appliances remain inoperable unless specifically authorized by the EIC, ensuring that all safety protocols are followed and that the integrity of the railway system is maintained.

This level of oversight helps prevent accidents and maintains the safe operation of the entire rail network, especially in areas where track conditions may be compromised.